Precise Point Positioning with BeiDou

Transcription

1 Precise Point Positioning with BeiDou Ole Ørpen Fugro Satellite Positioning AS Geodesi- og Hydrografidagene Stavanger, Nov Fugro 2013

2 Contents The G2 service Galileo Testing 2013 BeiDou Testing 2014 Operational use of additional GNSS Conclusions January

3 Fugro G2, GPS+GLONASS Service Orbit & clock Precise Point Positioning (PPP) Using more accurate orbits than broadcast ephemeris and very precise real-time satellite clock corrections Using carrier phase dual-frequency measurements to get decimeter accuracy Broadcast via Geostationary satellites / 3 /

4 G2 system overview / 4 /

5 G2 GPS + GLONASS Orbit/Clock Reference Stations and Broadcasts

6 Contents The G2 service Galileo Testing 2013 BeiDou Testing 2014 Operational use of additional GNSS Conclusions

7 Galileo, European Satellite Navigation System Full Operational Capability (FOC) 24+2 satellites , 30 Satellites Initial Operational Capability (IOC) 8 satellites 2015 (?) Full Galileo Constellation In-Orbit Validation (IOV) 4 satellites Can be used for testing 2011/2014 Galileo System Testbed 2 test satellites 2005/2008 / 7 /

8 Fugro s first Galileo Only Positioning, 18 March 2013 Four IOV satellites used in Precise Point Positioning (PPP) at 10 cm level Fugro generated high accuracy Galileo orbit/clock data using Fugro s tracking network Fugro tracking network, yellow means Galileo capable stations / 8 /

9 Fugro s first Galileo Only Positioning, 18 March 2013 And this was acknowledged by ESA / 9 /

10 Contents The G2 service Galileo Testing 2013 BeiDou Testing 2014 Operational use of additional GNSS Conclusions

11 BeiDou, Chinese Satellite Navigation System Regional Asia coverage MEO (Medium Earth Orbit) 5 GEO (Geostationary Orbit) 5 IGSO (Inclined Geostationary Orbit) Full world wide Coverage MEO: km 6 GEO/IGSO: km / 11 /

12 GPS, GLONASS and BeiDou in Perth 30 Aug 2013, 14:30 UTC In the Far East, including BeiDou, typically 25 satellites are available at any time / 12 /

13 BeiDou only in Chiwan, 4 hours, no GEOs Convergence with GPS/GLON No Geostationary BeiDou Sat Not 24 hour coverage with BeiDou only At Fugro G4 introduction, no GEO satellites will be used / 13 /

14 BeiDou only in Perth, 24 hours, with GEOs Convergence without GPS/GLON With Geostationary BeiDou 24 hour coverage with BeiDou only In Fugro G4, GEO satellites will be introduced later / 14 /

15 Contents The G2 service Galileo Testing 2013 BeiDou Testing 2014 Operational use of additional GNSS Conclusions

16 Obstructions In many applications obstructions is a problem. You miss out on satellites when you most need them, e.g. operation using Dynamic Positioning close to an offshore installation. / 16 /

17 Dual Independent Delivery Paths Network Control Centres in Perth and Houston utilise different satellite uplinks and different broadcast communications satellites in each ocean region to ensure link independence. / 17 /

18 Advantage of additional GNSS today Today and in the short term additional GNSS satellites are used in a combined solution, with improved: Availability Combined systems improve availability of satellite navigation in situations where parts of the sky are obscured (Shadowing, Scintillations). GPS World Magazine March 2010 Reliability, Accuracy Additional lines of position help to identify bad measurements (RAIM, Receiver Autonomous Integrity Monitoring) and improve satellite geometry. (Also improved spoofing detection) Lines of Position used in RAIM Outlier / 18 /

19 Advantage of additional GNSS in the future In the future when additional GNSS become available, they can be combined into two independent setups both with high reliability/availability: Each setup has enough satellites to provide reliable position with high availability Errors in one GNSS does not affect both setups Errors in corrections for one GNSS does not affect both setups Will provide increasingly better performance as BeiDou and Galileo become fully operational Possible configuration: / 19 /

20 Fugro G2 More is Better / 20 /

21 Fugro G4 Even More is Even Better / 21 /

22 Contents The G2 service Galileo Testing 2013 BeiDou Testing 2014 Operational use of additional GNSS Conclusions

23 Summary Chinas' BeiDou has 14 satellites in orbit Europe s Galileo GNSS System has 4 satellites in orbit Fugro G2 GPS/GLONASS orbit/clock decimeter level system being extended to other GNSS s First Fugro Galileo only Decimeter level positioning March 2013 First Fugro BeiDou only decimeter level positioning August 2014 Additional GNSS satellites provides opportunity for improved performance Improved availability, reliability and accuracy in combined systems Independent services E.g. GPS+BeiDou and GLONASS+Galileo Fugro will Launch G4 Service with BeiDou early 2015 / 23 /

24 And suddenly Galileo will be there.. GPS, GLONASS, Galileo and BeiDou in Oslo Have a look at: / 24 /

25 Thank You Fugro 2013

26 Galileo launch injection anomaly, Aug Upper stage of the Soyuz launch system did not work properly Inclination 49.8º (55), Ecc.: 0.23 (0) 13700/25900 km above ground Crosses GPS/GLONASS orb. In Van Allan Radiation belt Hydrazine and (cold) Helium pipes too close, Hydrazine pipe froze. The satellites have by far not enough Hydrazine fuel to reach correct orbit. Will Increase lowest orbit point Next launch in December will be delayed to February / 26 /

27 Galileo launch injection anomaly, Aug / 27 /

28 Galileo launch injection anomaly, Aug / 28 /